Re: [PATCH v3 2/4] i2c: piix4: Move SB800_PIIX4_FCH_PM_ADDR definition to amd_node.h

[Mario Limonciello <superm1@kernel.org>]

On 4/12/25 14:44, Ingo Molnar wrote:
> 
> * Borislav Petkov <bp@alien8.de> wrote:
> 
>> On Fri, Apr 11, 2025 at 07:09:56AM -0500, Mario Limonciello wrote:
>>> I was aiming for a header that we would conceivably use in all these places
>>> anyway.
>>>
>>> Can you suggest a more fitting existing header?  A new one felt too heavy
>>> for a single register define.
>>
>> No, the logic is: put it in the *right* header. Not in the "whatever-works"
>> header.
> 
> Yeah, it's the Linux kernel equivalent of: 'if you touch it, you own it',
> a.k.a. 'no good deed goes unpunished'. ;-)
> 

Ya.

>> So you can easily add a
>>
>> arch/x86/include/asm/platform.h
>>
>> header which contains exactly platform stuff. And FCH sounds like a platform
>> thing to me. Or at least southbridge or whatever that thing is called now. It
>> certainly ain't part of the CPU so platform should be more fitting.
>>
>> Unless someone has a better idea...
> 
> Yeah, so I think we can create a brand new <asm/amd_sb.h> header or so,
> because it's an AMD SB800 southbridge chipset register? We already have
> <asm/amd_nb.h>.
> 
> 'platform' might be a bit too generic and fungible I think: often the
> northbridge and the CPU is considered part of a 'platform' too.
> 
> Thanks,
> 
> 	Ingo

SB800 is pre-Zen stuff.  It's "before my time" - I guess that's the 
precursor to FCH being in the SoC but has the same functionality.

So I'm thinking <asm/amd_fch.h>.